import java.util.regex .*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int testCases = Integer.parseInt(in.nextLine());

        while (testCases > 0) {
            String pattern = in.nextLine();

            try {
                Pattern.compile(pattern);
                System.out.println("Valid");
            } catch (PatternSyntaxException e) {
                System.out.println("Invalid");
            }

            testCases--;
        }

        in.close();
    }
}